| 遵化新太古代豆荚状铬铁矿变形特征、变形机制及其大洋地幔扩张运移的指示意义 |
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| 引用本文： | 陈征,李江海,程素华,黄雄南.遵化新太古代豆荚状铬铁矿变形特征、变形机制及其大洋地幔扩张运移的指示意义[J].大地构造与成矿学,2006,30(2):149-160. |
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| 作者姓名： | 陈征 李江海 程素华 黄雄南 |
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| 作者单位： | 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京,100871 |
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| 基金项目： | 国家自然科学基金项目（40172066,40242014）资助. |
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| 摘 要： | 豆荚状铬铁矿是蛇绿岩套地幔构造岩中特征的矿产,其矿石发育丰富的岩浆活动-高温变形结构构造类型,豆荚状铬铁矿高温下仍具有稳定的物理化学特性,对认识大洋上地幔扩张、横向运移具有重要指示意义。在对遵化新太古代豆荚状铬铁矿显微构造的深入研究基础上,通过对比分析豆荚状铬铁矿结构构造特征(岩浆活动、低温变形),提出高温变形结构及其特征(拉长网孔结构、条带状、糜棱状结构等)。借鉴现代洋中脊及弧后盆地扩张的构造模型,提出华北新太古代豆荚状铬铁矿扩张中心形成后的显微构造演化序列,豆荚状铬铁矿变形机制的研究,可以提供认识早期大洋上地幔动力学过程的新线索。
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| 关 键 词： | 豆荚状铬铁矿 高温变形 大洋上地幔 板块构造 早期演化 |
| 文章编号： | 1001-1552(2006)02-0149-12 |
| 收稿时间： | 2005-05-30 |
| 修稿时间： | 2005-12-14 |
THE STRUCTURES AND MECHANISM OF DEFORMATION OF PODIFORM CHROMITES, AND ITS IMPLICATION FOR SPREADING OF OCEANIC UPPER MANTLE:EVIDENCE FROM PODIFORM CHROMITITE IN ZUNHUA, NORTH CHINA |
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| CHEN Zheng,LI Jianghai,CHENG Suhua,HUANG Xiongnan.THE STRUCTURES AND MECHANISM OF DEFORMATION OF PODIFORM CHROMITES, AND ITS IMPLICATION FOR SPREADING OF OCEANIC UPPER MANTLE:EVIDENCE FROM PODIFORM CHROMITITE IN ZUNHUA, NORTH CHINA[J].Geotectonica et Metallogenia,2006,30(2):149-160. |
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| Authors: | CHEN Zheng LI Jianghai CHENG Suhua HUANG Xiongnan |
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| Institution: | Key Laboratory of Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | Podiform chromitite is a characteristic mineral deposit in ophiolitic complex. Its various textures indicate important implication for the spreading of oceanic upper mantle and mineralization. Thousands of ore samples from the Neoarchean podiform chromitite in Zunhua have been checked in detail, to identify high-temperature deformation structures, including banded, flattened antinodular textures, mylonitic foliation and so on. Through integrated geological correlation, the structural deformation of podiform chromitites is ascribed to being related to the lateral spreading process of oceanic lithosphere. As podiform chromitite shows stable physical and chemical properties at high temperature, it is very useful to investigate the early tectonic evolution of oceanic lithosphere, and can provide important clues to the dynamic mechanism of oceanic upper mantle. |
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| Keywords: | podiform chromitite high-temperature deformation oceanic upper mantle plate tectonics early geological evolution |
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